Optical Lens With Wave-Shaped Aspheric Surfaces for Compact Focusing
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Solution Overview
Problem
The reduction in total optical length of mobile phone lenses has not been accompanied by a corresponding reduction in image sensor size, making it challenging to focus images in a shorter space effectively.
Innovation Solution
The optical lens design includes a series of aspheric lenses with specific surface shapes and arrangements, including wave-shaped surfaces, to condense incident light efficiently, satisfying conditional formulas that ensure optimal focusing within a compact space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the total optical length is reduced, then the lens becomes more compact, but the image sensor size remains large making focusing difficult
Solution Approach 1:
The patent employs aspheric surfaces with wave-shaped curvature profiles on multiple lens elements. These curved surfaces enable effective light focusing in a shorter optical path by optimizing the refraction angles, allowing the lens to achieve proper focus on the image sensor despite the reduced total optical length.
Solution Approach 2:
The patent optimizes specific parameter relationships including the ratio of focal length to optical length (0.5 < EFL/OL < 1.5), the curvature radii of aspheric surfaces, and the positioning of inflection points on wave-shaped surfaces. These parameter adjustments enable compact lens design while maintaining focusing precision on the image sensor.
2Length of moving object
If aspheric lenses with wave-shaped surfaces are used, then focusing in shorter space is improved, but lens design complexity increases
Solution Approach 1:
The patent divides the optical system into multiple discrete lens elements (at least four lenses), each with specific aspheric surface characteristics. This segmentation allows the complex focusing function to be distributed across multiple simpler components, making the overall system more manageable despite the sophisticated wave-shaped surface requirements.
Solution Approach 2:
The wave-shaped aspheric surfaces are designed with specific mathematical profiles that, while complex, provide systematic control over light refraction. The standardized aspheric surface design methodology enables these complex curved surfaces to be implemented consistently across multiple lens elements, reducing the practical complexity of manufacturing and design.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design allows for improved image focusing in a shorter space with controlled field curvatures and distortion, enhancing imaging quality.
Implementation Method 1
The optical lens design includes a series of aspheric lenses with specific surface shapes and arrangements, including wave-shaped surfaces, to condense incident light efficiently
Data Source
AI summary
An optical lens includes seven lenses sequentially arranged along an optical axis from an object side to an image side. A fourth lens includes a seventh surface facing the object side and an eighth surface facing the image side. Each of the seventh surface and the eighth surface includes an inflection point. The optical lens satisfies the following conditional formulas:−0.48<tan(EFL4*log(Slope_L42))<−0.38; conditional formula 1:1 mm<Infp_L41_y<1.05 mm; conditional formula 2:0.58 mm<Infp_L42_y<0.69 mm; condition 3:1<(123{circumflex over ( )}T4)/(456{circumflex over ( )}Slope_L41)<1.67. conditional formula 4: